I have a GIF which its dimensions is 200x300 pixels and it is animating fine.
But after i resize it to smaller dimensions (133x200 pixels), it doesn't
animate anymore.

Why is it not animating ?

Thanks.

"Fong Lun" wrote:

I am doing this in ASP.NET to display any images (including png, jpg,
gif...) in a <img> tag in a web page. I have put a size limit to the
container to display the image (gif for this example). This is how i decide
whether to resize the gif in my code.

1. The gif is in a table in SQL Server 2005 with image data type.
2. I retrieve the gif from the table using SELECT statement.
3. Below is my codes

Dim b() As Byte = data(0) 'data(0) is the image which is retrieved from a
SELECT statement
Dim img As New Bitmap(New MemoryStream(b))
Dim imgformat As System.Drawing.Imaging.ImageFormat =
System.Drawing.Imaging.ImageFormat.Gif

'the original gif dimensions is 200x300pixels
Dim h As Integer = img.Height
Dim w As Integer = img.Width

If h > 200 or w > 200 Then
If h > w Then
w = (200 / h) * w
h = 200
Else
h = (200 / w) * h
w = 200
End If
End If

Dim bmp As New Bitmap(w, h)
Dim gph As Graphics = Graphics.FromImage(bmp)
gph.InterpolationMode = Drawing2D.InterpolationMode.High
gph.DrawImage(img, 0, 0, w, h)

Dim ms As New MemoryStream
Dim picdata() As Byte

bmp.Save(ms, imgformat)
picdata = ms.GetBuffer

gph.Dispose()
bmp.Dispose()

Response.Clear()
Response.ClearHeaders()
Response.ContentType = "image/gif"
Response.BinaryWrite(picdata)

Hello,

When you load animated GIF as a Bitmap in .NET, it loads only first
frame of the animation. So after processing and saving it you will get
regular one-frame GIF. More of it, you create new bitmap using
Graphics and drawing to it of one frame only.

Take a look at the next article. Hope it will help.
http://www.codeproject.com/dotnet/NGif.asp

Sincerely,
Andrew
------
AForge.NET - open source framework for AI and CV
http://code.google.com/p/aforge/


On Mar 28, 3:10 am, Fong Lun <Fong... (AT) discussions (DOT) microsoft.com>
wrote:

The gdiplus .gif Encoder does not support .gif frames.

The .gif Encoder/Decoder in the new Microsoft "Windows Imaging Component" is
capable of reading, writing .gif frames.

It is supported on Windows XP SP2 and Windows Server 2003.

"Fong Lun" <FongLun (AT) discussions (DOT) microsoft.com> wrote